Change analysis on historical shorelines extracted from medium resolution satellite images: a case study on the southern coast of Peninsular Malaysia
Change analysis on historical shorelines extracted from medium resolution satellite images: a case study on the southern coast of Peninsular Malaysia
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中分辨率卫星图像提取的历史海岸线变化分析：以马来西亚半岛南部海岸为例
DOI：
10.1088/1755-1315/169/1/012101
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Mohd Radzi Abdul Hamid
中科院分区：
文献类型：
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作者：
S. A. Manaf;N. Mustapha;M. N. Sulaiman;N. Husin;Mohd Radzi Abdul Hamid
通过确定海岸线的情况，可以监测有关海岸地带变化的资料，例如侵蚀和增生。海岸线提供了陆地和水域的边界信息，这可以通过卫星图像来完成，而不是使用传统的地面调查，这是众所周知的费力和昂贵的。在本研究中，收集了1977年至2017年Landsat传感器的历史卫星图像。此外，还包括了一张SPOT-5的图像，以获得更多的数据进行分析。对于获取的每张卫星图像，使用监督机器学习技术将图像分为陆地和水域类。然后，定位两类边界，对分类图像进行后处理，提取岸线GIS矢量；利用提取的历史岸线进行进一步的变化分析，采用终点率法检查旧岸线和新岸线之间的差异。在这个阶段，为内部基线和外部基线创建了两个基线，以控制分析边界限制。然后，每隔50米创建历史海岸线的横断面。变化率统计表示在观测期间受影响的过程的累积汇总。研究发现，马来西亚半岛南部的丹绒比艾地区主要受到侵蚀的影响，而西海岸则受到增生的影响。侵蚀区主要受海岸带居住人口的影响，而淤积区主要受水土流失垦殖和建成区扩张的影响。本研究对马来西亚半岛南部受影响最严重的地区进行了30多年的观察，除了自然过程和人为活动外，这可能是由于海平面上升造成的。
Information on changes of coastal zones such as erosions and accretions can be monitored by identifying conditions of shorelines. Shorelines provide the boundary information of land and water, which can be performed by using satellite images rather than by using traditional ground survey, which is known as laborious and expensive. In this study, the historical satellite images of Landsat sensors were gathered from year 1977 to 2017. Additionally, one image of SPOT-5 was also included to get more data for analysis. For each satellite image acquired, supervised machine learning techniques were used to classify the image into land and water classes. Then, the shoreline GIS vector were extracted after locating boundaries of both classes and applying post-processing stages on the classified images. The historical shorelines extracted were used to do further change analysis using End Point Rate method to examine the differences between the older shorelines and the newer shorelines. At this stage, two baselines were created for inner and outer baselines to control the analysis boundary limit. Then, transects of the historical shorelines were created for every 50 m interval. The rate of change statistics represent a cumulative summary of the processes affected during the observation duration. The research findings observed that the southern region of Peninsular Malaysia which known as Tanjung Piai was affected mostly by erosion while the western coast was affected by accretion. The erosion regions were affected by the living population along the coastal areas while the accretion was caused by land reclamation against erosion or built-up area expansion. This study was conducted to observe the most affected areas in the southern Peninsular Malaysia for more than 30 years’ duration, potentially due to sea level rises besides natural processes and anthropogenic activities.